Method and system for identifying optical signal modulation format

A technology of modulation format and identification method, which is applied in the transmission system, electromagnetic wave transmission system, electrical components, etc., can solve the problems of cumbersome process, large amount, complex sampling and data algorithm, etc., and achieve the effect of simple structure and high cost performance

Inactive Publication Date: 2013-09-04
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

This method can automatically identify six commonly used optical modulation formats, including some advanced modulation formats, and is not sensitive to OSNR, chromatic dispersion (CD) and polarization mode dispersion

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  • Method and system for identifying optical signal modulation format
  • Method and system for identifying optical signal modulation format
  • Method and system for identifying optical signal modulation format

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Embodiment Construction

[0036] like figure 1 The all-optical modulation format recognition system shown includes: 1 tunable dispersion compensator (TDC), 2 optical amplifier (OA), 3 input optical filter, 4 nonlinear power transfer function (NPTF) generation module, 5 optical power meter (PM) and 6 control and digital signal processing (Ctr&DSP) modules. The optical signal to be identified first enters the TDC, and the TDC applies a certain CD value to the signal, and the output optical signal is amplified by the OA to a certain power and injected into the NPTF generating module. The PM measures the average power of the signal at the output end of the NPTF generation module. The Ctr&DSP module drives the TDC to generate a series of CD values ​​and records the PM measurement results as a CD-Power array and stores them in the memory. The DSP uses stored CD-Power samples of signals in various modulation formats to match the above measurements. The modulation format of the sample that best matches the ...

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Abstract

The invention relates to a method and system for identifying a modulation format based on optical signals in the field of optical fiber communication. The method includes the steps that a TDC exerts certain dispersion values on input optical signals to be identified and then outputs the optical signals, after passing through an optical amplifier, the optical signals are injected into a non-linear power transfer function NPTF generating module, and a optical power meter measures signal average power of the output end of the non-linear power transfer function NPTF generating module; a control and digital signal processing module drives the TDC to generate a series of dispersion values and records each dispersion value and the signal average power, corresponding to each dispersion value, of the output end of the NPTF generating module, and the dispersion values and corresponding signal average power are stored as a dispersion-signal average power measured value array. Matching is carried out among various dispersion-signal average power samples with known modulation format signals and the dispersion-signal average power measured value array, and the modulation format of the best matched sample is discriminated as the modulation format of the input signals. The method and system for identifying the optical signal modulation format does not need any prior information at work, is suitable for signals with various modulation formats and speed and has the advantages of being simple in structure and high in cost performance.

Description

technical field [0001] The invention relates to the technical fields of optical fiber communication, all-optical signal and digital signal processing. Background technique [0002] The ultimate goal of communication is to achieve fast, effective, safe and accurate transmission of information. Due to the limitation of channel capacity, communication signals need to adopt different modulation methods to meet different needs of users. With the rapid development of modern communication technology, the modulation methods in the communication system tend to be diversified and complicated. The identification of the modulation mode of the communication signal is an important part of the field of interception signal processing. It needs to determine the modulation mode of the received signal and extract the corresponding modulation mode under the condition of complex environment and noise interference without relying on other prior knowledge. Parameters to provide a basis for furth...

Claims

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Application Information

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IPC IPC(8): H04B10/075
Inventor 崔晟邱晨
Owner HUAZHONG UNIV OF SCI & TECH
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